create vpn and unix account for Andrey to access granet

@andrey-star is currently doing a remote internship with myself and @seirl. We would like to give access to him to granet, in order to be able to execute some graph queries locally there.

Dear sysadms, can you create a VPN access for him, a unix account, and deploy it on granet?

(ping @andrey-star on the forge for the needed information)

Plan:

• sysadm: create unix account ...

• sysadm: ... with ssh access

• andrey: create the csr and provide it here [1]

• sysadm: sign the csr (validity period ~150 days) and provide the exported crt

• andrey: configure the vpn connection

• andrey: check ssh access to granet.internal.softwareheritage.org

• [1] https://docs.softwareheritage.org/sysadm/user-management/openvpn/openvpn.html#for-users

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Migrated from T4029 (view on Phabricator)